Pipe wrench



' Aug. 23, 927.

. V v 1,640,265 M. w. snow PIPE WRENCH Filed June 19, 1926 2Sheets-Sheet 1 Mam/e17 )4/ 6% Z I f Aug. 23, 1927.

M. W. CROW PIPE WRENCH Filed June 19, 1926 2 Sheets-Sheet 2 Man/827 (23gFatented Aug. 23, 1927.

PATENT OFFICE.

MARVEN WILLIAM CROW, OF FORT DODGE, IOWA.

PIPE WRENCH.

Application filed. June 19,

This invention relates to a pipe wrench, the general object of theinvention being to provide means whereb the jaws of the wrench willautomatically grip an object placed between them in such a manner thatthe more pull exerted on the wrench, the tighter the wrench will gripthe object.

Another object of the invention is to make one aw of the wrench in theform of a rotary disk having teeth thereon, this disk also acting toadjust the movable jaw.

This invention also consists in certain 'other features of constructionand in the combination and arrangen'i-ent of the several parts, to behereina ter fully described, illustrated in the accompanying drawings,and specifically pointed out in the appended claim.

In describing my invention in detail, reference will be had to theaccompanying drawings, wherein like characters denote like orcorresponding parts throughoutthe several views, and in which Fig. 1 isan elevation of the improved wrench,

Fig. 2 is an edge view thereof,

Fig. 3 is a section on line 3-3 of Fig. 2,

Fig. t is a section on line 1-4 of Fig. 1, and Fig. 5 shows a section online 55 of Fig. 1. V

In these views, 1 indicates the handle of a. wrench which is formed withan enlarged inner end 2 which is provided with a recess 8 which opensout through a corner of said end. A U-shaped frame 4 is fastened to thisenlarged end by the bolts 5 and 6. the bolt 6 forming a bearing for atoothed disk or wheel 7 which is arranged in the recess. This frameforms a guide for the shank 8 of the movable jaw 9, said shank beingprovided with the teeth 10 on its inner edge which are engaged by theteeth of the disk, and the jaw 9 is provided with the gripping teeth 11.A plate 12 is pressed against a part of the teeth of the shank 8 bymeans of a coiled spring 13 arranged in a recess 1a in the part 2, theplate having a stem 15 thereon which extends into the recess ant aroundwhich the spring is placed. The part 2 is formed with a shallow recess16 1926. Serial No. 117,156.

to receive the plate when the shank 8 is pressed against the handle 1.

From the foregoing, it'will be seen that when a pipe or other object isseized by the wrench, the entrance of the object between the jaws willcause the rotation of the wheel or disk 7, and the movement of this diskis communicated to the shank 8 through the teeth 10 sothat the jaw 9will be moved inwardly to engage the object. Thus the object isautomatically gripped by the placing of the-wrench thereon and the forceexerted on the wrench to turn the pipe or object will cause the wrenchtomore firmly grip the object.

The spring-pressed plate 12 acts to hold the movable jaw 9 against theobject, though by pressing the inner end of the shank 8 downwardly toforce the plate 12 in its recess, the movable jaw can be readilyadjusted to enable the wrench to fit various sizes of objects.

It is thought from the foregoing description that the advantages andnovel features of my invention will be readily apparent.

I desire it to be understood that I may make changes in the constructionand in the combination and arrangement of the several parts, providedthat such changes fall with- -in the scope of the appended claim.

hat I- claim is A wrench of the class described comprising a handlehaving an enlarged inner end which is provided with a recess, ayokeshaped frame fastened to the enlarged portion and having a partforming a guide, a movable jaw having a shank slidably mounted in theguide, the inner edge of the shank being toothed, a toothedwheelrotatably mounted. in the recess with its teeth engaging the teethof the shank and some of its teeth projecting beyond the end of theenlarged part so that they will engage and be placed between the jawsandthus the wheel will be rotated, and a spring-pressed plate carried bythe handle and engaging the shank. I

In testimony whereof I atfix my signature.

MARVEN WILLIAM CROW,

